security & full stack engineering: how can I combine these for a career?

I'm in cybersecurity now, and have a few years experience, SEC+, and have AZ-900 exam scheduled.

Can I remain in a security-related field while using full-stack engineering?

1) What positions would these be?

2) as part of a course I'm taking, I'd like to come up with an individual project to showcase FSE work. I want it to be security-related (not some typical quirky game, or app, but something more practical). What would you recommend?

I'm open to hearing any …

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